I have a mind emp (yes I'm probably necroing more threads. Whatever)
I find the mind powerset good for controllers who don't want to draw alot of aggro, like buffers. A good buffer should have (I think anyway, i'm not experienced that experienced with buffers) pretty high recharge to get those buffs going out to the team. The more recharge you get, the less defense you'll probably have, and yeah, I know that's subjective. My emp bases none of it's secondaries on hitting mobs, like a kin does. So no aggro there. Mass confuse, no aggro, mass hyp, no aggro. Mind/emp, very little aggro. It's kind of fun for a change, especially if you know me. I'm always in there, even if I shouldn't be. Kinda interesting for me to play a different way, even if I'm squirming in my seat while doing so because I wanna go run up and kick something (yes, I have kick four slotted for s/l defense and concept, because my mind/emp is a horse) NEIGH!!!! Ummm... I digress. Long recharge on mass confuse? Balance it out with what happens when you DO mass confuse something. Soft control, they're not hitting your team. They are all hitting each other. Hard, fast and repeated......err, I just reread that but I'll choose to leave it. Anyway, fun stuff, and very effective. It melts the mobs you're using it on with a quickness. Worth the long recharge I think
In my opinion, mind control for a troller complements secondaries. If you want a toon that rocks straight out of the box and all the way to 50 on the weight of its controls, and makes amazing use of aoe controlling goodness (that happens to only check against psi defense), I recommend rolling a mind dominator. AMAZING!! You'll love it, and it will be far more apparent where mind control really shines on its own. If it says anything, I have two level 50 mind doms. A mind/nrg slotted for recharge for more aoe holds that's good for mobs, and a mind/psi I plan to damage incarnate for amazing solo craziness. And yes, both rock solo.
I love my Mind/FF. I always use it on TFs where we don't have a true tank, we have multiple AV fights, or I just want to play it. I haven't gotten around to making a build but as is (SOs and IOs) it's a lot of fun and I feel like a big contribution when we have a Scrapper tanking Dr.Kahns.